Nemertea

Nemertea, also known as Ribbon Worms, are a phylum of soft-bodied invertebrate animals found both in marine and freshwater environments. They are notable for their very long and narrow cylindrical bodies, typically reaching up to two meters in length. The digestive system of Nemertea is highly developed, consisting of two separate compartments and a proboscis, a retractable and extendable structure used to capture prey. Nemertea play an important role in the marine and freshwater food webs, as they are scavengers, consuming organic matter and detritus, as well as feeding on such prey as plankton and small mollusks. Their presence promotes the turnover of nutrients and the cycling of energy and matter in their ecosystems. Nemertea are also becoming increasingly important as a research focus, as they provide insight into the evolution of nervous systems.